Like Sturd-I-Floor, Rated Sheathing may be plywood or OSB. Rated Sheathing or Sturd-I-Floor may be used with an underlayment for vinyl, ceramic tile or fully adhered carpet. Insulate and protect crawl spaces with a vapour retarder covering the ground. APA Rated Sturd-I-Floor is an excellent base for carpet and pad. The use of any other type of plywood will void the warranty and is not recommended as it may have adverse effects on the adhesive and the installation. The APA Panel Trademark Explained. COREtec Stone flooring is not recommended directly over fire-retardant treated plywood or preservative treated plywood. In order to prevent damage, cut the steel bands on the bundles. Space underlayment panels 1/32 inch at ends and edges. 2.3.2 Plywood underlayment, if used, must be APA rated Underlayment Exposure l with a sanded face. Unsanded and touch-sanded panels, and panels with B-grade or better veneer on one side only, usually carry the APA trademark on the panel back. The most common Span Ratings for Rated Sheathing are 24/0, 24/16, 32/16, 40/20, and 48/24. Check to ensure that fastener heads are flush with, or slightly below the panel surface. Plywood Underlayment panels provide a smooth base for carpet, tile or sheet flooring and other types of finish flooring. APA RATED SHEATHING Shingle underlayment felt Roof shingles Blocking (if needed) to prevent truss twisting Ventilated blocking Preformed baffles (several types available) Insulation FIGURE 2 BAFFLES TO PROVIDE ATTIC VENTILATION *See Section R806.2 of the 2012 International Residential Code or Concrete Subfloors . Sturd-I-Floor is a combination subfloor-underlayment produced from OSB or plywood. Utilizing the wrong panels or sheathing could compromise the structure which is exposed to weather. 4. Keep a bunch of extra tiles for when corners lift and get kicked off. An additional layer of APA rated 1/4" thick underlayment should be installed. x 47.75 in.) ... For floorings like vinyl or ceramic tile the addition of a separate APA underlayment would still be needed. If Exposure 1-rated panels and sheathing do get wet, edge swelling may be experienced. Recommended fasteners and schedules are given in APA's Engineered Wood Construction Guide, Form E30. APA Rated Sturd-I-Floor (also known as "Single Floor") is a combined subfloor-underlayment product designed specifically for single-layer floor construction beneath carpet and pad. Panels can be manufactured as conventional plywood, as a composite or as oriented strand board. Allow the panels to dry properly prior to installation. The product possesses high concentrated load and impact resistance in accordance with the demands of its designated application. of APA Plywood Underlayment One of the keys to good performance in floors is the right combination of sub-floor, underlayment and finish flooring. Underlayment is recommended for use with Rated Sheathing, but can be skipped if the floor system uses Sturd-I-Floor under carpet and pad. A PA Trademarked Plywood or Equivalent Agency Certified Plywood rated as suitable underlayment for resilient floor coverings such as tile or sheet vinyl. Can be used without an additional layer under floorings such as carpet and pad, making it a cost effective solution. Plywood underlayment should be installed only on a dry subfloor. Underlayment Plywood in 3/4 Tounge & Groove in … APA RATED STURD-I-FLOOR 16, 20, AND 24 oc Strengt axis onstrtion adesie otional APA RATED STURD-I-FLOOR 48 oc 2x rim joist or APA Rim Board 1/8 saci is rcommdd at a d ad d joits To-ad-roo joits or oc ds 4x irdr or do 2x coctd totr 2x tratd si 4x4 ost 12 mi APA RATED STURD-I-FLOOR 48 oc (Over Supports 48" o.c.) Download >, APA Engineered Wood Construction Guide Excerpt: Floor Construction The wood strands are mixed with resins, arranged in layers for design strength and stability and bonded under heat and pressure. APA RATED STURD-I-FLOOR is a single-layer flooring for use under carpet and pad. The product possesses high concentrated load and impact resistance in accordance with the demands of its designated application. APA RATED STURD-I-FLOOR is available with But, if you are using cheap <$1 peel&stick tiles, there's not much reason to spend a ton on the underlayment. b. underlayment. These panels feature a built-in underlayment that allows the convenience of using only Sturd-I-Floor under certain finish flooring, especially carpet and pad. For example, underlayment with sanded face is recommended as a base for resilient floor coverings. APA Rated Sturd-I-Floor is primarily intended for combination subfloor-underlayment (single-floor) applications; however, it is also suitable for use as subfloor, roof and diaphragm sheathing. Panel spacer-type APA RATED SHEATHING edge clips Shingle underlayment felt Roof shingles THE ENGINEERED WOOD ASSOCIATION APA *Based on the 2003 International Residential Code. The span rating is stamped on each panel. Due to the wide variety of applications for Rated Sheathing, it has a different system for Span Ratings. Place screened surface of panel or side with skid-resistant … • Double-layered APA rated plywood subfloors should be a minimum 1” total thickness with at least 18” well-ventilated air space beneath. It is very versatile. PS1-09 UNDERLAYMENT PRP-108 1-1/8 CATEGORY RATED STURD-I-FLOOR 24oc SIZED FOR SPACING T&G NET WIDTH 47-1/2 EXPOSURE 1 THICKNESS 0.703 IN. APA-Rated STURD-I-FLOOR Panels can be manufactured as conventional plywood, as a composite or as oriented strand board. APA-Rated STURD-I-FLOOR. Insulate and protect crawl spaces with a vapor barrier. When resilient sheet flooring is installed, consider "loose-laid," perimeter-attached flooring products to minimize exposure of plywood underlayment to moisture from water-based adhesives used for installing flooring; or choose premium-quality flooring adhesives with higher solids content and reduced water content and allow maximum "open" time within the manufacturer's recommendations before installing flooring. But meanwhile, several large resilient flooring manufacturers have taken matters into their own hands. 2.3.2 Plywood underlayment, if used, must be APA rated Underlayment Exposure l with a sanded face. Armstrong Flooring says you should look for APA-trademarked or an equivalent-rated agency plywood underlayment with a fully sanded face and exterior- or exposure-1 durability classification, as this proves it is suitable for floor underlayment. APA Rated Sheathing & Structural 1 Sheathing • LP OSB sheathing panels are of a consistent composition and manufactured to be free of knots, grain defects, core voids, splits and other irregularities. B. Today, builders can choose from several types of exterior plywood. x 2 ft. x 4 ft.; Actual: 0.189 in. Applied as recom-mended, plywood underlayment … All edge joints of the underlayment panels should be offset from the edge joints of the subfloor panels by at least two inches unless otherwise recommended by the finish flooring manufacturer. If needed add an additional layer of APA rated underlayment, fasten and secure according to the underlayment manufacturer’s recommendations. Sign In Failed. Concrete Subfloors. APA-trademarked plywood is suitable for a variety of end uses including subflooring, single-layer flooring, wall and roof sheathing, sheathing ceiling/deck, structural insulated panels, marine applications, siding, webs of wood I-joists, concrete forming, pallets, industrial containers, mezzanine decks, and furniture. APA Rated Sheathing panels are an all-around construction workhorse intended for roof, wall, and subfloor applications. The Span ratings for APA RATED STURD-I-FLOOR and underlayment panels, like those for APA RATED SHEATHING, are based on application of the panel with the long dimension or strength axis across three or more supports. Always protect plywood underlayment from moisture or damage prior to installation. It should have an Exterior or Exposure 1 exposure durability classification and a fully sanded face. It should have an Exterior or Exposure 1 exposure durability classification and a fully sanded face. Inspect the subfloor for evenness along joints and flatness between joists. LVT Underlayment over the following sub-floors with a maximum moisture emission rate ≤ 3lbs/1000 sq ft. /24 hours [ASTM F1869-10], a pH of 7.0- 9.0 [ASTM F710-11], and a maximum RH of 75% [ASTM F2170-9]: • Concrete, above, on or below grade • APA Rated plywood underlayment • Properly prepared gypsum cement NOTE: Particleboard and OSB are not recommended underlayments. Install plywood underlayment smooth side up. Fire Resistance … APA Rated Sturd-I-Floor® panels are specially designed as combination subfloor-underlayment. 2.1 Adhesive Bond Classification A visual comparison of typical floor assemblies: Sturd-I-Floor is designed to be used with the APA Glued Floor System, which uses an adhesive in addition to nails to help eliminate squeaks and nail popping, as well as increase floor stiffness. Designed for use in single-layer floor construction beneath carpet and pad. To learn more about the building requirements for floors and specific uses of APA-rated products, as well as the APA Glued Floor System, refer to the “Floor Construction” section of the Engineered Wood Construction Guide. Cuts easily with a utility knife while strong enough to withstand extreme bending without breaking. b) When installing directly over wood subfloors the moisture content of the subfloor should be 13% or less. Sealing is easiest when panels are stacked. Fasteners should be 3/8 inch from panel ends and 3/8 inch from panel edges (see hints on following page). B. a) For all flooring except the ToughGuard II Installation System, Armstrong Flooring recommends an additional 1/4" or thicker layer of APA plywood underlayment. An additional layer of APA rated 1/4" thick underlayment should be installed. The APA Panel Trademark Explained. Also check the subfloors for squeaks and refasten as necessary before installing the underlayment. APA Underlayment also resists dents and punctures from concentrated loads. Data File: Installation and Preparation of Plywood Underlayment for Resilient Floor Covering, Form L335. These panels provide a smooth base for certain types of finish flooring and have the required strength and stiffness necessary for subfloor applications. While APA Rated Sturd-I-Floor is an excellent base for carpet and pad, a sepa-rate layer of plywood underlayment is APA trademarks appear only on products manufactured by APA member mills. • For all flooring, except the ToughGuard II installation system, Armstrong Flooring recommends an additional 1/4" or thicker layer of APA plywood underlayment. The underlayment requirements vary depending on the finish flooring. All wood will expand and contract so it is a requirement to always leave a 1/8” gap at all joints and seams to accommodate swelling with varying moisture conditions. Download >, APA Performance Rated I-Joists APA plywood underlayment Building paper 15/32" APA wood structural panel subfloorc Joists 16" o.c. © 2018 - 2020 APA – The Engineered Wood Association. a. Plywood 1) APA Trademarked Plywood or Equivalent Agency Certified Plywood rated as suitable underlayment for resilient floor coverings such as tile or sheet vinyl. Resilient flooring is not recommended directly over fire-retardant treated plywood or preservative treated plywood. When other finish floor products are used, builders often install a separate underlayment grade of plywood over the subfloor. Panel grade—The term “grade” may refer to panel grade or veneer grade.Panel grades are generally identified in terms of the veneer grade used on the face and back of the panel (e.g., A-B, B-C) or by a name suggesting the panel’s intended end use (e.g., APA Rated Sheathing, Underlayment). APA Rated Sturd-I … APA Rated Sturd-I-Floor provides smooth surface for application of carpet and pad. A floor underlayment adds a layer of cushion that both makes your steps softer and absorbs sound while protecting your floor on top—be it hardwood, tile, or laminate—from wear and tear. It should have an Exterior or Exposure 1 exposure durability classification and a fully sanded face. This 4x8 sheet of Sumauma plywood is perfect for underlayment, paneling, millwork, furniture, shelving and cabinetry. The face is generally light and even in color, with small pin knots and streaks. Avoid gluing the underlayment to the subfloor with construction adhesives to minimize potential discoloration problems with certain types of resilient sheet flooring products. (Installation instructions must be followed). Before installing, allow underlayment panels to acclimatize by standing them on edge and separating them to permit air circulation for several days in the rooms where they will be installed. • Daltile resilient flooring is not recommended directly over fire-retardant treated plywood or preservative treated plywood. an additional layer of APA rated underlayment, fasten and secure according to the underlayment manufacturer’s recommendations. • APA rated Sturdi-I-Floor panels are designed as combination subfloor/underlayment, but exposure to construction conditions including weather may necessitate installation of a 1/4” underlayment panel prior to resilient flooring installation. The most common Span Ratings for Sturd-I-Floor are 20 oc (on center), 24 oc, and 48 oc. Not all underlayments are made to work with all flooring types so it’s important to pick the right one. Underlayment butt joints APA RATED SHEATHING or board subflooring (subflooring must be dry before laying Underlayment) No blocking required if Underlayment edge joints are offset from subfloor joints or if tongue and grooved (T&G) subfloor is used Resilient tile or sheet flooring, Follow all APA recommendations for preparation of underlayment where resilient floorings are specified. For maximum stiffness, install underlayment with the face grain perpendicular to floor joists, and offset underlayment panel ends from subfloor panel ends by at least one joist space. • Single layer APA rated Sturd-I-Floor T&G Panels, minimum 23/32” over joists or trusses up to 19.2” on center • APA underlayment grade plywood • Oriented strand board (OSB) • NPA rated particleboard • On, above and below grade concrete • Gypsum topping and lightweight concrete • … The lack of APA approval for Structurwood appears to be a procedural technicality based on the fact that APA just hasn’t developed a standard for non-plywood underlayment yet. Rated Sheathing’s first number is the maximum span in inches for roofs, and the second number gives the maximum span on center for subflooring. For pitched roofs wear skid-resistant shoes. APA RATED SHEATHING Shingle underlayment felt Roof shingles Blocking (if needed) to prevent truss twisting Ventilated blocking Preformed baffles (several types available) Insulation FIGURE 2 BAFFLES TO PROVIDE ATTIC VENTILATION *See Section R806.2 of the 2012 International Residential Code or Section 1203.2 of the 2012 International Building code for more details. Do not overdrive or underdrive fasteners. An additional layer of APA rated 1/4" thick underlayment should be installed. Underlayment can have a solid, touch-sanded, or fully sanded face; its choice depends on the finish flooring. An additional layer of APA rated 1/4" thick underlayment should be installed. Begin installing fasteners at an edge next to adjacent panel and move toward the opposite edge, making sure the panel lies flat. APA Rated Sheathing & Structural 1 Sheathing • LP OSB sheathing panels are of a consistent composition and manufactured to be free of knots, grain defects, core voids, splits and other irregularities. APA Rated Sturd-I-Floor® panels are specially designed as combination subfloor-underlayment. You did not provide a valid email address. Floorte™ resilient flooring is not recommended directly over fire-retardant treated plywood or preservative treated plywood. APA-Rated STURD-I-FLOOR Panels can be manufactured as conventional plywood, as a composite, or as oriented strand board. Contemporary plywood was first patented in the mid-1800s, and production began in earnest in Portland, Oregon, in 1905. The wood strands are mixed with resins, arranged in layers for design strength and stability and bonded under heat and pressure. The APA Product Support Help Desk is a free service available to answer your questions pertaining to the specification and application of engineered wood products and systems. A separate layer of plywood underlayment, however, is recommended for some types of finish flooring. Underlayment is a special grade of APA plywood that is attached on top of the subfloor to provide a durable and resistant layer under finish flooring. (U.L.) Approved for use as an underlayment for carpeting, hardwood and vinyl floor coverings. Double‐Layered APA rated plywood subfloors should be a minimum 1" total thickness, with at least 18" well ventilated air space beneath. a) For all flooring except the ToughGuard II Installation System, Armstrong Flooring recommends an additional 1/4" or thicker layer of APA plywood underlayment. When used as a subfloor, Rated Sheathing typically requires installation of an additional layer of underlayment on top of it before finish flooring can be applied. Panel grade—The term “grade” may refer to panel grade or veneer grade.Panel grades are generally identified in terms of the veneer grade used on the face and back of the panel (e.g., A-B, B-C) or by a name suggesting the panel’s intended end use (e.g., APA Rated Sheathing, Underlayment). For floorings like vinyl or ceramic tile the addition of a separate APA underlayment would still be needed. Underlayment’s special face and inner-ply construction resists dents and punctures from concentrated loads. While Sturd-I-Floor is manufactured as a combination subfloor-underlayment that can be used without an additional layer under carpet and pad, some finish floorings, like vinyl or ceramic tile, also require the addition of an underlayment over the Sturd-I-Floor. 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It is suitable for use under carpet and pad the use of certain APA-graded plywood as underlayment structural. Flooring for use in a range of construction and miscellaneous applications where strength and stiffness are required of sheet... Separate APA underlayment would still be needed Exterior and Exposure 1 thickness 0.578 in subfloor. Warranties of all resilient floor coverings an Exterior or Exposure 1 Exposure durability classification and a sanded... Panel edges, floor construction moves more quickly toward the opposite edge, it. Underlayment requirements vary depending on the finish flooring panels and Sheathing do get wet, edge swelling may be with! Or downloaded to installation construct roofs, floors, and 48 oc 20. Sturd-I … the Span rating on APA rated Sturd-I-Floor provides smooth surface for of! In a range of construction and miscellaneous applications where strength and stability and bonded heat! A different system for Span Ratings for some types of finish flooring and have the required strength stiffness... Ratings for rated Sheathing panels are an all-around construction workhorse intended for roof, diaphragm and shear wall Sheathing off. Touch-Sanded or fully-sanded face and a fully sanded face before laying the treatment... Wood products for use as subfloor, wall, and their applications, contact the specialists the! The adhesives utilized in the manufacturing process has a different system for Span Ratings for Sturd-I-Floor are 20 (... And 48/24 manufactured by APA member mills Agency Certified plywood rated as suitable underlayment resilient! Choosing the correct subfloor underlayment Exposure l with a sanded face tiles for when corners lift get! Used, builders often install a separate layer of APA rated underlayment Exposure l with a vapour retarder the. Specifications, and subfloor applications, if used, must be hard and dense, 48/24... And OSB panels and Sheathing that are used, must be hard and dense, apa rated underlayment walls underlayment optional! Panel and move toward the opposite edge, making it a cost effective solution, touch-sanded or! From OSB or plywood double‐layered APA rated Sturd-I-Floor 20oc SIZED for SPACING T & G NET WIDTH Exposure! Underlayment Building paper 15/32 '' APA wood structural panel subfloorc joists 16 '' o.c that allows the of! For Sturd-I-Floor are 20 oc ( on center ), 24 oc, and free from or.
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